Quartz (Pale Rose or Milky Variety)
Silicon Dioxide (SiO2)
mineral
Category
Glass
Browse glass specimens identified by the Rock Identifier community.
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Quartzite Pebble
Metamorphic rock predominantly composed of Quartz (SiO2)
metamorphic
Quartz
Silicon Dioxide (SiO2)
mineral
Libyan Desert Glass
Libyan Desert Glass (SiO2 with trace elements)
mineral (impactite)
Obsidian
Obsidian (Volcanic Glass, ~70% SiO2)
igneous
Black Obsidian
Volcanic Glass (predominantly SiO2)
igneous
Agate
Agate (Chalcedony), SiO2
Mineral
Quartz
Silicon dioxide (SiO2)
Mineral
Fluorite (left), Sodalite (middle), Dumortierite/Tumbled Quartzite (right)
Calcium Fluoride (CaF2), Sodium Aluminum Silicate Chloride (Na8(Al6Si6O24)Cl2), Aluminum Borosilicate (Al7(BO3)(SiO4)3O3)
mineral
Rose Quartz
Silicon Dioxide (SiO2) with inclusions of Dumortierite or similar minerals
mineral
Snowflake Obsidian
Obsidian with Cristobalite inclusions (SiO2)
igneous
Gold Sheen Obsidian
Volcanic Glass (SiO2 + impurities)
igneous
Pumice
Pumice (Amorphous volcanic glass)
igneous
Chert (Nodule)
Cryptocrystalline Silica (SiO2)
sedimentary
Rose Quartz
Quartz (Silicon Dioxide, SiO2) with trace inclusions of dumortierite
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Green Slag Glass
Amorphous Silica Glass (Anthropogenic)
Industrial byproduct (often mistaken for obsidian or mineral)
Chert (v. Flint)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Opalite
Man-made synthetic glass with opalescent effects (SiO2 + metal oxides)
mineraloid
Diamond (or Diamond Simulant)
Carbon (C) or Zirconium dioxide (ZrO2) for CZ
gemstone
Quartz (Citrine or Iron-Stained)
Silicon Dioxide (SiO2)
mineral
Quartz Pebbles
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Pumice
Pumice (Amorphous volcanic glass)
igneous
Tektite (Indochinite)
Tektite (Natural silica glass)
meteorite
Obsidian
Volcanic Glass (predominantly SiO2)
igneous
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)
mineral
Quartzite River Pebble
Quartzite (SiO2)
metamorphic
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite
metamorphic
Red Quartzite Cobble
Quartzite (primarily SiO2)
metamorphic
Quartzite Pebble
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Chert (Jasper/Flint variant)
Microcrystalline Quartz (SiO2)
sedimentary
Green Aventurine
Aventurine Quartz (SiO2 with inclusions)
mineral
Rhyolitic Tuff
Rhyolitic Tuff / Pyroclastic rock
igneous
Aventurine
Aventurine Quartz (SiO2)
mineral
Quartzite (River Pebble)
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Chert (often called Jasper or Flint in this color variety)
Silicon Dioxide (SiO2)
sedimentary
Limestone with Calcite Crystals
Sedimentary Rock containing Calcium Carbonate (CaCO3)
sedimentary
Black Obsidian
Obsidian (Volcanic Glass), primarily SiO2 (Silicon Dioxide)
igneous
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
Mineral (Variety of Quartz)
Chert / Microcrystalline Quartz
Silicon Dioxide (SiO2)
sedimentary